DIY Car Transportation Rack

here is a very easy to do, simple solution to avoid the onewheel from rolling around in the trunk of a car during transportation.

since I sometimes have two onewheels in the trunk while driving to some nice spots, I wanted a solution which prevents the onewheel from rumbling around. at first I had a more sophisticated solution in mind, but during building it turned out that a very easy construction can do the trick in around 15 minutes.